このxen用更新プログラムでは、以下の問題を修正します。修正されたセキュリティ問題：

  - エミュレーション中にSYSCALLシングルステップが誤って処理され、これにより権限昇格が引き起こされる可能性があります。（XSA-204、bsc#1016340、CVE-2016-10013）

  - CMPXCHG8Bエミュレーションで、オペランドサイズのオーバーライドを無視することに失敗し、これによって情報漏洩が引き起こされ可能性があります。（XSA-200、bsc#1012651、CVE-2016-9932）

  - PVゲストは、サービス拒否を引き起こす割り込みをマスクできる場合があります。（XSA-202、bsc#1014298、CVE-2016-10024）

  - VMFUNCエミュレーションでのNULLポインターチェックの欠落により、ハイパーバイザーのクラッシュが引き起こされ、これによりサービス拒否が引き起こされる可能性があります。（XSA-203、bsc#1014300、CVE-2016-10025）

注意：Tenable Network Securityは、前述の記述ブロックをSUSEセキュリティアドバイザリから直接抽出しています。Tenableでは、新たな問題を持ち込まずに、できる限り自動的に整理して書式設定するようにしています。

Xen プロジェクトによる報告：

シングルステップ例外の一般的な動作は命令の開始時に判別され、命令の終了時に#DBトラップが発生します。通常の動作によりユーザー空間が権限を昇格できるため、SYSCALL（および実装されていませんが、SYSRET）の動作は異なります。（この動作の違いは文書化されていないようです。）Xenは、命令の開始時のフラグに基づいて、誤って例外を発生させていました。

命令エミュレーターを呼び出すことができるゲストユーザー空間が、この欠陥を利用して、その権限をゲストカーネルの権限に昇格させる可能性があります。

Jan Beulich and Jann Horn discovered multiple vulnerabilities in the Xen hypervisor, which may lead to privilege escalation, guest-to-host breakout, denial of service or information leaks.

In additional to the CVE identifiers listed above, this update also addresses the vulnerabilities announced as XSA-213, XSA-214 and XSA-215.

This update for xen fixes several issues. These security issues were fixed :

  - CVE-2016-10155: The virtual hardware watchdog     'wdt_i6300esb' was vulnerable to a memory leakage issue     allowing a privileged user to cause a DoS and/or     potentially crash the Qemu process on the host     (bsc#1024183)

  - CVE-2017-2620: In CIRRUS_BLTMODE_MEMSYSSRC mode the     bitblit copy routine cirrus_bitblt_cputovideo failed to     check the memory region, allowing for an out-of-bounds     write that allows for privilege escalation (bsc#1024834)

  - CVE-2017-2615: An error in the bitblt copy operation     could have allowed a malicious guest administrator to     cause an out of bounds memory access, possibly leading     to information disclosure or privilege escalation     (bsc#1023004)

  - CVE-2014-8106: A heap-based buffer overflow in the     Cirrus VGA emulator allowed local guest users to execute     arbitrary code via vectors related to blit regions     (bsc#907805)

  - CVE-2016-9911: The USB EHCI Emulation support was     vulnerable to a memory leakage issue while processing     packet data in 'ehci_init_transfer'. A guest     user/process could have used this issue to leak host     memory, resulting in DoS for the host (bsc#1014507)

  - CVE-2016-9921: The Cirrus CLGD 54xx VGA Emulator support     was vulnerable to a divide by zero issue while copying     VGA data. A privileged user inside guest could have used     this flaw to crash the process instance on the host,     resulting in DoS (bsc#1015169)

  - CVE-2016-9922: The Cirrus CLGD 54xx VGA Emulator support     was vulnerable to a divide by zero issue while copying     VGA data. A privileged user inside guest could have used     this flaw to crash the process instance on the host,     resulting in DoS (bsc#1015169)

  - CVE-2016-10013: Xen allowed local 64-bit x86 HVM guest     OS users to gain privileges by leveraging mishandling of     SYSCALL singlestep during emulation (bsc#1016340).

  - CVE-2016-9932: CMPXCHG8B emulation on x86 systems     allowed local HVM guest OS users to obtain sensitive     information from host stack memory via a     'supposedly-ignored' operand size prefix (bsc#1012651).

  - CVE-2016-9101: A memory leak in hw/net/eepro100.c     allowed local guest OS administrators to cause a denial     of service (memory consumption and QEMU process crash)     by repeatedly unplugging an i8255x (PRO100) NIC device     (bsc#1013668)

  - CVE-2016-9776: The ColdFire Fast Ethernet Controller     emulator support was vulnerable to an infinite loop     issue while receiving packets in 'mcf_fec_receive'. A     privileged user/process inside guest could have used     this issue to crash the Qemu process on the host leading     to DoS (bsc#1013657)

  - A malicious guest could have, by frequently rebooting     over extended periods of time, run the host system out     of memory, resulting in a Denial of Service (DoS)     (bsc#1022871)

  - CVE-2016-10024: Xen allowed local x86 PV guest OS kernel     administrators to cause a denial of service (host hang     or crash) by modifying the instruction stream     asynchronously while performing certain kernel     operations (bsc#1014298)

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The version of Citrix XenServer installed on the remote host is missing a security hotfix. It is, therefore, affected by multiple vulnerabilities :

  - A flaw exists when invoking the instruction emulator     that is triggered during the handling of SYSCALL by     single-stepping applications. A local attacker can     exploit this to execute code with elevated privileges     on the guest. (CVE-2016-10013)

  - An out-of-array memory access error exists in the     memory_exchange() function within file common/memory.c     due to improper checking of XENMEM_exchange input. An     attacker on a 64-bit PV guest VM who has administrative     privileges can exploit this issue to access arbitrary     system memory locations, which can then be potentially     used for further compromising the host. (CVE-2017-7228)

  - A memory leak issue exits due to improper cleanup being     performed during guest destruction. An attacker on the     guest can exploit this, by repeatedly rebooting, to     exhaust memory on the host system, resulting in a denial     of service condition.

This update for xen fixes the following issues :

  - A Mishandling of SYSCALL singlestep during emulation     which could have lead to privilege escalation. (XSA-204,     bsc#1016340, CVE-2016-10013)

  - CMPXCHG8B emulation failed to ignore operand size     override which could have lead to information     disclosure. (XSA-200, bsc#1012651, CVE-2016-9932)

  - PV guests may have been able to mask interrupts causing     a Denial of Service. (XSA-202, bsc#1014298,     CVE-2016-10024)

  - A missing NULL pointer check in VMFUNC emulation could     lead to a hypervisor crash leading to a Denial of     Servce. (XSA-203, bsc#1014300, CVE-2016-10025)

This update was imported from the SUSE:SLE-12-SP2:Update update project.

This updates xen to version 4.5.5 to fix the following issues :

  - An unprivileged user in a guest could gain guest could     escalate privilege to that of the guest kernel, if it     had could invoke the instruction emulator. Only 64-bit     x86 HVM guest were affected. Linux guest have not been     vulnerable. (boo#1016340, CVE-2016-10013)

  - An unprivileged user in a 64 bit x86 guest could gain     information from the host, crash the host or gain     privilege of the host (boo#1009107, CVE-2016-9383)

  - An unprivileged guest process could (unintentionally or     maliciously) obtain or ocorrupt sensitive information of     other programs in the same guest. Only x86 HVM guests     have been affected. The attacker needs to be able to     trigger the Xen instruction emulator. (boo#1000106,     CVE-2016-7777)

  - A guest on x86 systems could read small parts of     hypervisor stack data (boo#1012651, CVE-2016-9932)

  - A malicious guest kernel could hang or crash the host     system (boo#1014298, CVE-2016-10024)

  - The epro100 emulated network device caused a memory leak     in the host when unplugged in the guest. A privileged     user in the guest could use this to cause a DoS on the     host or potentially crash the guest process on the host     (boo#1013668, CVE-2016-9101)

  - The ColdFire Fast Ethernet Controller was vulnerable to     an infinite loop that could be trigged by a privileged     user in the guest, leading to DoS (boo#1013657,     CVE-2016-9776)

  - A malicious guest administrator could escalate their     privilege to that of the host. Only affects x86 HVM     guests using qemu older version 1.6.0 or using the     qemu-xen-traditional. (boo#1011652, CVE-2016-9637)

  - An unprivileged guest user could escalate privilege to     that of the guest administrator on x86 HVM guests,     especially on Intel CPUs (boo#1009100, CVE-2016-9386)

  - An unprivileged guest user could escalate privilege to     that of the guest administrator (on AMD CPUs) or crash     the system (on Intel CPUs) on 32-bit x86 HVM guests.
    Only guest operating systems that allowed a new task to     start in VM86 mode were affected. (boo#1009103,     CVE-2016-9382)

  - A malicious guest administrator could crash the host on     x86 PV guests only (boo#1009104, CVE-2016-9385)

  - An unprivileged guest user was able to crash the guest.
    (boo#1009108, CVE-2016-9377, CVE-2016-9378)

  - A malicious guest administrator could get privilege of     the host emulator process on x86 HVM guests.
    (boo#1009109, CVE-2016-9381)

  - A vulnerability in pygrub allowed a malicious guest     administrator to obtain the contents of sensitive host     files, or even delete those files (boo#1009111,     CVE-2016-9379, CVE-2016-9380)

  - A privileged guest user could cause an infinite loop in     the RTL8139 ethernet emulation to consume CPU cycles on     the host, causing a DoS situation (boo#1007157,     CVE-2016-8910)

  - A privileged guest user could cause an infinite loop in     the intel-hda sound emulation to consume CPU cycles on     the host, causing a DoS situation (boo#1007160,     CVE-2016-8909)

  - A privileged guest user could cause a crash of the     emulator process on the host by exploiting a divide by     zero vulnerability of the JAZZ RC4030 chipset emulation     (boo#1005004 CVE-2016-8667)

  - A privileged guest user could cause a crash of the     emulator process on the host by exploiting a divide by     zero issue of the 16550A UART emulation (boo#1005005,     CVE-2016-8669)

  - A privileged guest user could cause a memory leak in the     USB EHCI emulation, causing a DoS situation on the host     (boo#1003870, CVE-2016-7995)

  - A privileged guest user could cause an infinite loop in     the USB xHCI emulation, causing a DoS situation on the     host (boo#1004016, CVE-2016-8576)

  - A privileged guest user could cause an infinite loop in     the ColdFire Fash Ethernet Controller emulation, causing     a DoS situation on the host (boo#1003030, CVE-2016-7908)

  - A privileged guest user could cause an infinite loop in     the AMD PC-Net II emulation, causing a DoS situation on     the host (boo#1003032, CVE-2016-7909)

  - Cause a reload of clvm in the block-dmmd script to avoid     a blocking lvchange call (boo#1002496)

Multiple vulnerabilities have been discovered in the Xen hypervisor.
The Common Vulnerabilities and Exposures project identifies the following problems :

CVE-2016-10013 (xsa-204)

Xen mishandles SYSCALL singlestep during emulation which can lead to privilege escalation. The vulnerability is only exposed to 64-bit x86 HVM guests.

CVE-2016-10024 (xsa-202)

PV guests may be able to mask interrupts causing a Denial of Service.

For Debian 7 'Wheezy', these problems have been fixed in version 4.1.6.lts1-5.

We recommend that you upgrade your xen packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to its self-reported version number, the Xen hypervisor installed on the remote host is missing a security update. It is, therefore, affected by a privilege elevation vulnerability in the instruction emulator when handling SYSCALL by single-stepping applications. This is due to incorrect exceptions being raised based on the flags at the start of an instruction. A local attacker can exploit this issue to gain elevated privileges on the guest operating system.

Please note the following items :

  - The vulnerability is only exposed to 64-bit x86 HVM     guests.

  - On Xen version 4.6 and earlier, the vulnerability is     exposed to all guest user processes, including     unprivileged processes in such guests.

  - On Xen version 4.7 and later, the vulnerability is     exposed only to guest user processes granted a degree of     privilege (e.g., direct hardware access) by the guest     administrator, or else to all user processes when the     VM has been explicitly configured with a non-default CPU     vendor string (in xm/xl, this would be done with a     'cpuid=' domain config option).

  - A 64-bit guest kernel which uses an IST for #DB handling     will most likely mitigate the issue but will have a     single unexpected #DB exception frame to deal with. In     practice, this means that Linux is not vulnerable.

  - The vulnerability is not exposed to 32-bit HVM guests.
    This is because the emulation bug also matches real     hardware behavior, and a 32-bit guest kernel using     SYSCALL will already have to be using a Task Gate for     handling #DB to avoid being susceptible to an escalation     of privilege.

  - The vulnerability is not exposed to PV guests.

  - ARM systems are not vulnerable.

Note that Nessus has not tested for this vulnerability but has instead relied only on the changeset versions based on the xen.git change log.
Nessus did not check guest hardware configurations or if patches were applied manually to the source code before a recompile and reinstall.

ID	名稱	產品	系列	已發布	已更新	嚴重性
96076	SUSE SLED12 / SLES12セキュリティ更新プログラム：xen （SUSE-SU-2016:3208-1）	Nessus	SuSE Local Security Checks	2016/12/22	2021/1/6	high
95974	FreeBSD：xen-kernel -- x86：エミュレーション中のSYSCALLシングルステップの不適切な処理（942433db-c661-11e6-ae1b-002590263bf5）	Nessus	FreeBSD Local Security Checks	2016/12/21	2021/1/4	high
100071	Debian DSA-3847-1 : xen - security update	Nessus	Debian Local Security Checks	2017/5/10	2021/1/11	high
97828	SUSE SLES11 Security Update : xen (SUSE-SU-2017:0718-1)	Nessus	SuSE Local Security Checks	2017/3/20	2021/6/3	critical
99377	Citrix XenServer multiple vulnerabilities (CTX222565)	Nessus	Misc.	2017/4/14	2019/1/2	high
96250	openSUSE Security Update : xen (openSUSE-2017-2)	Nessus	SuSE Local Security Checks	2017/1/3	2021/1/19	high
96252	openSUSE Security Update : xen (openSUSE-2017-4)	Nessus	SuSE Local Security Checks	2017/1/3	2021/1/19	high
96491	Debian DLA-783-1 : xen security update	Nessus	Debian Local Security Checks	2017/1/16	2021/1/11	high
96960	Xen SYSCALL singlestep Handling Privilege Escalation (XSA-204)	Nessus	Misc.	2017/2/2	2020/7/10	high

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